There is a grappleable Powamp directly above each of the 3 peaks.

If carrying a flash suit without Morph, Hi-Jump or Gravity can be used to attach to the center Powamp from the left.

Requires:

"h_navigateUnderwater"
"canUseEnemies"
"Grapple"
{
  "or": [
    "h_midAirShootUp",
    "HiJump",
    "Gravity"
  ]
}

Clears obstacles: B

Dev note: This strat is only able to bring one crab up without dropping down to 2. Adding a strat to do that is not worth adding, because with grapple, you can bypass the strats that need A.